Siemens’ Drive Technologies Division has received an order from ThyssenKrupp Robins to supply the gearless drive system for an overland conveyor system at Xstrata Copper’s Las Bambas copper mine in Peru.
The new conveyor system’s start-up is scheduled for 2014. Siemens said that when compared to conventional drive systems, gearless drives not only boast higher efficiency, availability and reliability, but they also require less maintenance
Las Bambas will be the second Xstrata Copper mine in Peru to use gearless drives from Siemens on its overland conveyors. Antapaccay mine was the first, and began commercial operations at the beginning of November 2012.
ThyssenKrupp is designing and supplying the overland conveyors at Las Bambas. At around 2.5km long, each of the two overland conveyors will transport ore from the mine to the processing plant. The belts will be 1.8m wide, travel at 6.5m/s, and are designed to transport hourly around 8,500t of material.
The Siemens drive systems for each of the two overland conveyors comprise two low-speed synchronous motors – each with a total power of 4,400kW – and the associated Sinamics SL150 cycloconverters.
Siemens said that this gearlessdrive solution features a number of advantages over the combination of high-speed motor and gearbox drives usually used on conveyor systems. The size of the motor is not limited by the size of gearbox available, therefore it eliminates the necessity to install multi-motor drives. The power required to drive a belt can be provided by just one drive per belt pulley. This enables the size of the electrical room to be reduced, which saves space and weight.
It added that the elimination of a whole series of mechanical and electrical components increases the reliability and efficiency of the overall system by 3-4%.